<template>
  <div class="slide-show" @mouseover="clearInv" @mouseout="runInv">
    <div class="slide-img">
      <a :href="slides[nowIndex].href">
        <transition name="slide-trans">
          <img v-if="isShow" :src="slides[nowIndex].src">
        </transition>
        <transition name="slide-trans-old">
          <img v-if="!isShow" :src="slides[nowIndex].src">
        </transition>
      </a>
    </div>
    <h2>{{slides[nowIndex].title}}</h2>
    <ul class="slide-pages">
      <li @click="goto(prevIndex)">&lt;</li>
      <li v-for="(item,index) in slides" @click="goto(index)">
        <a :class="{on:index=== nowIndex}">{{index+1}}</a>
      </li>
      <li @click="goto(nextIndex)">&gt;</li>
    </ul>
  </div>
</template>

<script>
  export default{
      props:{
        slides:{
            type:Array,
             default:[]
        },
        inv:{
            type:Number,
            default:1000
        }
      },
      data(){
          return{
              nowIndex:0,
            isShow:true
          }
      },
    computed:{
      prevIndex(){
          if(this.nowIndex === 0){
              return this.slides.length-1
          }else{
              return this.nowIndex -1
          }
      },
      nextIndex(){
          if (this.nowIndex=== this.slides.length -1){
              return 0
          }else {
              return this.nowIndex + 1
          }
      }
    },
    methods:{
          goto(index){
              this.isShow=false
            setTimeout(()=>{
                  this.isShow=true
              this.nowIndex=index
              this.$emit('onchange',index)
            },10)
          },
          runInv(){
              this.invId = setInterval(() => {
                 // console.log(123)
                  this.goto(this.nextIndex)
              },this.inv)
          },
      clearInv(){
              clearInterval(this.invId)
      }
    },
    mounted(){
          this.runInv()
    }
  }
</script>
<style scoped>
  .slide-trans-enter-active {
    transition: all .5s;
  }
  .slide-trans-enter {
    transform: translateX(900px);
  }
  .slide-trans-old-leave-active {
    transition: all .5s;
    transform: translateX(-900px);
  }
  .slide-show {
    position: relative;
    margin: 15px 15px 15px 0;
    width: 900px;
    height: 500px;
    overflow: hidden;
  }
  .slide-show h2 {
    position: absolute;
    width: 100%;
    height: 100%;
    color: #fff;
    background: #000;
    opacity: .5;
    bottom: 0;
    height: 30px;
    text-align: left;
    padding-left: 15px;
  }
  .slide-img {
    width: 100%;
  }
  .slide-img img {
    width: 100%;
    position: absolute;
    top: 0;
  }
  .slide-pages {
    position: absolute;
    bottom: 10px;
    right: 15px;
  }
  .slide-pages li {
    display: inline-block;
    padding: 0 10px;
    cursor: pointer;
    color: #fff;
  }
  .slide-pages li .on {
    text-decoration: underline;
  }
</style>
